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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<script type="text/javascript" src="jquery-3.5.1.min.js"></script>
<style type="text/css">
div.option {
display: inline-block;
margin-right: 2em;
}
</style>
</head>
<body>
<fieldset id="STEP1">
<legend>STEP 1 / Load image</legend>
<p>
<input type="file" onchange="onFileSelected(this)">
</p>
</fieldset>
<fieldset id="STEP2">
<legend>STEP 2 / Decrease color depth</legend>
<p>
<input type="button" id="BW1" value="Black and White" onClick="onClickBlackAndWhite()">
<input type="button" id="GRAY8" value="Gray scale" onClick="onClickGrayScale()">
<input type="button" id="RGB3" value="3-bit RGB(111)" onClick="onClick3BitRGB111()">
<input type="button" id="RGB8" value="8-bit RGB(332)" onClick="onClick8BitRGB332()">
<input type="button" id="RGB16" value="16-bit RGB(565)" onClick="onClick16BitRGB565()">
<input type="button" id="RGB24" value="24-bit RGB(888)" onClick="onClick16BitRGB888()">
</p>
<p>
<div class="option"><input type="checkbox" id="dither" checked>Dither</div>
<div class="option">Gamma:<input type="number" id="gamma" value="1.6" min="1" max="3" step="0.1" style="width:4em">(only for B/W and 3-bit)</div>
</p>
</fieldset>
<fieldset id="STEP3">
<legend>STEP 3 / Define output format</legend>
<p>
<div class="option">
RGB color order:
<select id="color_order">
<option value="RGB">Red - Green - Blue</option>
<option value="RBG">Red - Blue - Green</option>
<option value="GRB">Green - Red - Blue</option>
<option value="GBR">Green - Blue - Red</option>
<option value="BRG">Blue - Red - Green</option>
<option value="BGR">Blue - Green - Red</option>
</select>
</div>
</p>
<p>
<div class="option">
Data type:
<select id="data_type">
<option value="uint8_t">uint8_t</option>
<option value="uint16_t" selected>uint16_t</option>
<option value="uint32_t">uint32_t</option>
</select>
</div>
<div class="option">
Byte order:
<select id="byte_order">
<option value="BIG" selected>Big endian</option>
<option value="LITTLE">Little endian</option>
</select>
</div>
</p>
<div class="option">
Output format:
<select id="output_format">
<option value="C" selected>C array declaration</option>
<option value="BIN">Binary</option>
<option value="HEX">Hex dump</option>
</select>
</div>
</p>
<p>
<input type="button" value="Preview" onclick="onClickPreview()">
<input type="button" value="Download" onclick="onClickDownload()">
</p>
</fieldset>
<p>
<div id="image_description"></div>
<canvas id="canvas1" width=256 height=256 style="border: 1px solid;"></canvas>
</p>
<p>
Preview (only 8 lines from the top)<br>
<textarea id="text_preview" cols="100" rows="8" wrap="off"></textarea>
</p>
<script language="javascript">
var dictPixelFormat = {
dicName: "pixel format",
RGB24: {
bits: 24,
serializeMode: 1,
rgbBits: [ 8, 8, 8 ],
defaultDataType: "uint32_t"
},
RGB16: {
bits: 16,
serializeMode: 1,
rgbBits: [ 5, 6, 5 ],
defaultDataType: "uint16_t"
},
RGB8: {
bits: 8,
serializeMode: 1,
rgbBits: [ 3, 3, 2 ],
defaultDataType: "uint8_t"
},
RGB3: {
bits: 4,
serializeMode: 4,
rgbBits: [ 1, 1, 1 ],
defaultDataType: "uint8_t"
},
GRAY8: {
bits: 8,
serializeMode: 2,
defaultDataType: "uint8_t"
},
BW1: {
bits: 1,
serializeMode: 3,
defaultDataType: "uint8_t"
}
};
var dictDataType = {
dicName: "data type",
uint8_t: {
bits: 8,
dataTypeC: "uint8_t"
},
uint16_t: {
bits: 16,
dataTypeC: "uint16_t"
},
uint32_t: {
bits: 32,
dataTypeC: "uint32_t"
}
};
var dictColorOrder = {
dicName: "color order",
RGB: [ 0, 1, 2 ],
RBG: [ 0, 2, 1 ],
GRB: [ 1, 0, 2 ],
GBR: [ 1, 2, 0 ],
BRG: [ 2, 0, 1 ],
BGR: [ 2, 1, 0 ]
};
var dictByteOrder = {
dicName: "byte order",
BIG: {
1: [ 0 ],
2: [ 0, 1 ],
3: [ 0, 1, 2 ],
4: [ 0, 1, 2, 3 ]
},
LITTLE: {
1: [ 0 ],
2: [ 1, 0 ],
3: [ 2, 1, 0 ],
4: [ 3, 2, 1, 0 ]
}
};
var dictOutputFormat = {
dicName: "output format",
C: {
mode: "C",
preview: 0
},
BIN: {
mode: "BIN",
preview: 1
},
HEX: {
mode: "HEX",
preview: 0
}
};
var masterImage;
var convertedImage;
var ser;
$(function(){
$("#STEP1").prop( "disabled", false );
$("#STEP2").prop( "disabled", true );
$("#STEP3").prop( "disabled", true );
});
function onFileSelected( input ) {
var file = input.files[0];
var reader = new FileReader();
reader.onload = onFileLoaded;
reader.readAsDataURL( file );
}
function onFileLoaded( e ) {
var src_data = e.target.result;
var img = new Image();
img.crossOrigin = "anonymous";
img.onload = onImageSetted;
img.src = src_data;
}
function onImageSetted( e ) {
masterImage = createImageData( e.target );
$("#STEP1").prop( "disabled", false );
$("#STEP2").prop( "disabled", false );
$("#STEP3").prop( "disabled", false );
$("#RGB24").click();
}
function createImageData( img ) {
var cv = document.createElement( 'canvas' );
cv.width = img.naturalWidth;
cv.height = img.naturalHeight;
var ct = cv.getContext( '2d' );
ct.drawImage( img, 0, 0 );
var data = ct.getImageData( 0, 0, cv.width, cv.height );
return data;
}
function updateMainView() {
var canvas = $("#canvas1")[0];
canvas.width = convertedImage.image.width;
canvas.height = convertedImage.image.height;
canvas.getContext( '2d' ).putImageData( convertedImage.image, 0, 0 );
$("#image_description").text( convertedImage.pixelFormatDescription );
}
function onClickBlackAndWhite() {
conv = new ImageConverter_BW();
conv.dithering = $("#dither:checked").val();
conv.gamma = $("#gamma").val();
convertedImage = conv.decreaseColor( masterImage );
updateMainView();
setDefaultForPixelFormat( "BW1" );
}
function onClickGrayScale() {
conv = new ImageConverter_GrayScale();
convertedImage = conv.decreaseColor( masterImage );
updateMainView();
setDefaultForPixelFormat( "GRAY8" );
}
function onClick3BitRGB111() {
conv = new ImageConverter_3bit();
conv.dithering = $("#dither:checked").val();
conv.gamma = $("#gamma").val();
convertedImage = conv.decreaseColor( masterImage );
updateMainView();
setDefaultForPixelFormat( "RGB3" );
}
function onClick8BitRGB332() {
conv = new ImageConverter_RGB332();
conv.dithering = $("#dither:checked").val();
convertedImage = conv.decreaseColor( masterImage );
updateMainView();
setDefaultForPixelFormat( "RGB8" );
}
function onClick16BitRGB565() {
conv = new ImageConverter_RGB565();
conv.dithering = $("#dither:checked").val();
convertedImage = conv.decreaseColor( masterImage );
updateMainView();
setDefaultForPixelFormat( "RGB16" );
}
function onClick16BitRGB888() {
conv = new ImageConverter_RGB888();
convertedImage = conv.decreaseColor( masterImage );
updateMainView();
setDefaultForPixelFormat( "RGB24" );
}
function setDefaultForPixelFormat( fmt ) {
var pixelFormatConfig = lookupConfigDictionary( fmt, dictPixelFormat );
$("#data_type").val( pixelFormatConfig.defaultDataType );
}
function lookupConfigDictionary( item, dict, desc ) {
if ( item in dict ) {
return dict[item];
} else {
if ( desc == undefined ) {
desc = dict.dicName;
}
throw new Error( "Unexpected " + desc );
}
}
function onClickPreview() {
generatePreview();
}
function onClickDownload() {
generatePreview();
window.location.href = ser.blobURL;
}
function generatePreview() {
ser = new ImageSerializer();
ser.colorOrderConfig = lookupConfigDictionary( $("#color_order").val(), dictColorOrder );
ser.dataTypeConfig = lookupConfigDictionary( $("#data_type").val(), dictDataType );
ser.byteOrderConfig = lookupConfigDictionary( $("#byte_order").val(), dictByteOrder );
ser.outputFormatConfig = lookupConfigDictionary( $("#output_format").val(), dictOutputFormat );
ser.serializeConvertedImage( convertedImage );
var reader = new FileReader();
reader.onload = function() {
var preview = "";
if ( ser.outputFormatConfig.preview == 0 ) {
var text = reader.result;
var p = 0;
var count = 0;
while ( count < 8 ) {
var pp = text.indexOf( "\n", p );
if ( pp == -1 ) {
break;
}
p = pp + 1;
count ++;
if ( p >= text.length ) {
break;
}
}
preview = text.substring( 0, p ).trimEnd();
} else if ( ser.outputFormatConfig.preview == 1 ) {
var data = new Uint8Array( reader.result );
for ( var i = 0 ; i < data.length ; i ++ ) {
if ( i % 16 != 0 ) {
preview += " ";
}
preview += ( "00" + data[i].toString( 16 ).toUpperCase() ).substr( -2 );
if ( i % 16 == 15 ) {
preview += "\n";
}
if ( i == 16 * 8 - 1 ) {
break;
}
}
}
$("#text_preview").val( preview );
}
if ( ser.outputFormatConfig.preview == 0 ) {
reader.readAsText( ser.blob );
} else if ( ser.outputFormatConfig.preview == 1 ) {
reader.readAsArrayBuffer( ser.blob );
}
}
function pickColor( img, x, y ) {
var p;
if ( y === undefined ) {
p = x;
} else {
p = y * img.width * 4 + x * 4;
}
return new RGBColor( img.data[p+0], img.data[p+1], img.data[p+2] );
}
function createTripletFloatArray( len ) {
var arr = Array( len );
for ( var i = 0 ; i < len ; i ++ ) {
arr[i] = new Float32Array( 3 );
}
return arr;
}
function createUintArray( bits, len ) {
if ( bits == 8 ) {
return new Uint8Array( len );
} else if ( bits == 16 ) {
return new Uint16Array( len );
} else if ( bits == 32 ) {
return new Uint32Array( len );
}
}
class RGBColor {
constructor() {
if ( arguments.length == 0 ) {
this.R = 0;
this.G = 0;
this.B = 0;
} else if ( arguments.length == 1 && arguments[0] instanceof Uint8ClampedArray ) {
this.R = arguments[0][0];
this.G = arguments[0][1];
this.B = arguments[0][2];
} else if ( arguments.length == 1 && arguments[0] instanceof RGBColor ) {
this.R = arguments[0].R;
this.G = arguments[0].G;
this.B = arguments[0].B;
} else if ( arguments.length == 3 ) {
this.R = arguments[0];
this.G = arguments[1];
this.B = arguments[2];
} else {
throw new Error( "Not implemented" );
}
}
get luminance() {
return 0.299*this.R + 0.587*this.G + 0.114*this.B;
}
isEqual( col ) {
return this.R == col.R && this.G == col.G && this.B == col.B;
}
calcDistance( col ) {
return Math.sqrt( ( this.R - col.R ) * ( this.R - col.R ) + ( this.G - col.G ) * ( this.G - col.G ) + ( this.B - col.B ) * ( this.B - col.B ) );
}
}
function clip( a ) {
if ( a < 0 ) {
a = 0;
} else if ( a > 255 ) {
a = 255;
}
return a;
}
class ImageSerializer {
constructor() {
this.convertedImage = null;
this.pixelFormatConfig = null;
this.colorOrderConfig = null;
this.dataTypeConfig = null;
this.byteOrderConfig = null;
this.outputFormatConfig = null;
this.nativeBits = 0;
this.nativeArray = null;
this.dataArray = null;
this.blob = null;
}
get blobURL() {
return URL.createObjectURL( this.blob );
}
serializeConvertedImage( cnv ) {
this.pixelFormatConfig = lookupConfigDictionary( cnv.pixelFormat, dictPixelFormat );
this.convertedImage = cnv;
this.toNativeData();
this.toDataArray();
if ( this.outputFormatConfig.mode == "BIN" ) {
this.toBinaryBlob();
} else if ( this.outputFormatConfig.mode == "C" ) {
this.toCCodeBlob();
} else if ( this.outputFormatConfig.mode == "HEX" ) {
this.toHexBlob();
}
}
toBinaryBlob() {
var src = this.dataArray;
var N = src.length * ( this.dataTypeConfig.bits / 8 );
var bytes = new Uint8Array( N );
if ( this.dataTypeConfig.bits == 8 ) {
for ( var i = 0 ; i < N ; i ++ ) {
bytes[i] = src[i];
}
} else {
var srcBits = this.dataTypeConfig.bits;
var ratio = srcBits / 8;
var temp = new Uint8Array( ratio );
var pDest = 0;
for ( var pSrc = 0 ; pSrc < src.length ; pSrc ++ ) {
for ( var i = 0 ; i < ratio ; i ++ ) {
temp[i] = ( src[pSrc] >>> ( ( ratio - i - 1 ) * 8 ) ) & 0xff;
}
for ( var i = 0 ; i < ratio ; i ++ ) {
bytes[pDest] = temp[this.byteOrderConfig[ratio][i]];
pDest ++;
}
}
}
this.blob = new Blob( [ bytes.buffer ], { type: "application/octet-stream" } );
}
toCCodeBlob() {
var typeStr = this.dataTypeConfig.dataTypeC;
var len = this.dataArray.length;
var indent = " ";
var digits = this.dataTypeConfig.bits / 4;
var text = `${typeStr} image[${len}] = {\n`;
var line = "";
var lineCount = 0;
for ( var i = 0 ; i < len ; i ++ ) {
if ( i % 16 == 0 ) {
if ( line != "" ) {
text += indent + line + "\n";
}
line = "";
} else {
line += " ";
}
line += "0x" + ( ( "00000000" + this.dataArray[i].toString( 16 ).toUpperCase() ).substr( -digits ) );
if ( i < len-1 ) {
line += ",";
}
}
if ( line != "" ) {
text += indent + line + "\n";
}
text += "};\n";
this.blob = new Blob( [ text ], { type: "application/octet-stream" } );
}
toHexBlob() {
var src = this.dataArray;
var N = src.length * ( this.dataTypeConfig.bits / 8 );
var bytes = new Uint8Array( N );
if ( this.dataTypeConfig.bits == 8 ) {
for ( var i = 0 ; i < N ; i ++ ) {
bytes[i] = src[i];
}
} else {
var srcBits = this.dataTypeConfig.bits;
var ratio = srcBits / 8;
var temp = new Uint8Array( ratio );
var pDest = 0;
for ( var pSrc = 0 ; pSrc < src.length ; pSrc ++ ) {
for ( var i = 0 ; i < ratio ; i ++ ) {
temp[i] = ( src[pSrc] >>> ( ( ratio - i - 1 ) * 8 ) ) & 0xff;
}
for ( var i = 0 ; i < ratio ; i ++ ) {
bytes[pDest] = temp[this.byteOrderConfig[ratio][i]];
pDest ++;
}
}
}
var text = "";
var line = "";
for ( var i = 0 ; i < N ; i ++ ) {
if ( i % 16 == 0 ) {
if ( line != "" ) {
text += line + "\n";
}
line = "";
} else {
line += " ";
}
line += ( "00" + bytes[i].toString( 16 ).toUpperCase() ).substr( -2 );
}
if ( line != "" ) {
text += line + "\n";
}
this.blob = new Blob( [ text ], { type: "application/octet-stream" } );
}
toDataArray() {
if ( this.nativeBits == this.dataTypeConfig.bits ) {
this.dataArray = this.nativeArray;
} else if ( this.nativeBits < this.dataTypeConfig.bits ) {
var src = this.nativeArray;
var dest = createUintArray( this.dataTypeConfig.bits, src.length );
for ( var i = 0 ; i < src.length ; i ++ ) {
dest[i] = src[i];
}
this.dataArray = dest;
} else {
var ratio;
if ( this.pixelFormatConfig.bits == 24 && this.dataTypeConfig.bits == 8 ) {
ratio = 3;
} else {
ratio = this.nativeBits / this.dataTypeConfig.bits;
}
var src = this.nativeArray;
var srcBits = this.pixelFormatConfig.bits;
var destBits = this.dataTypeConfig.bits;
var dest = createUintArray( destBits, src.length * ratio );
var temp = createUintArray( destBits, ratio );
var bitmask = ( 1 << destBits ) - 1;
var pDest = 0;
for ( var pSrc = 0 ; pSrc < src.length ; pSrc ++ ) {
for ( var i = 0 ; i < ratio ; i ++ ) {
temp[i] = ( src[pSrc] >>> ( ( ratio - i - 1 ) * destBits ) ) & bitmask;
}
for ( var i = 0 ; i < ratio ; i ++ ) {
dest[pDest] = temp[this.byteOrderConfig[ratio][i]];
pDest ++;
}
}
this.dataArray = dest;
}
}
toNativeData() {
var width = this.convertedImage.image.width;
var height = this.convertedImage.image.height;
var imageData = this.convertedImage.image.data;
var output = null;
if ( this.pixelFormatConfig.serializeMode != 3 ) {
var N = width * height;
if ( this.pixelFormatConfig.bits != 24 ) {
output = createUintArray( this.pixelFormatConfig.bits, N );
this.nativeBits = this.pixelFormatConfig.bits;
} else {
output = createUintArray( 32, N );
this.nativeBits = 32;
}
var ptrSrc = 0;
var ptrDest = 0;
for ( var y = 0 ; y < height ; y ++ ) {
for ( var x = 0 ; x < width ; x ++ ) {
if ( this.pixelFormatConfig.serializeMode == 1 ) { // RGB
var pixel = 0;
for ( var i = 0 ; i < 3 ; i ++ ) {
var rgbElement = this.colorOrderConfig[i];
var bitwidth = this.pixelFormatConfig.rgbBits[rgbElement];
pixel = ( pixel << bitwidth ) | ( imageData[ptrSrc+rgbElement] >> ( 8 - bitwidth ) );
}
ptrSrc += 4;
output[ptrDest] = pixel;
ptrDest ++;
} else if ( this.pixelFormatConfig.serializeMode == 2 ) { // Gray scale
output[ptrDest] = imageData[ptrSrc];
ptrSrc += 4;
ptrDest ++;
}
}
}
} else {
var N = Math.ceil( width/8 )*8 * height;
output = new Uint8Array( N );
this.nativeBits = 8;
// not implemented yet
}
this.nativeArray = output;
}
}
class ImageConverter {
constructor() {
this.dithering = true;
this.gamma = 1.6;
}
get pixelFormat() {
throw new Error( "Not implemented" );
}
get pixelFormatDescription() {
throw new Error( "Not implemented" );
}
_prepareNewImage( orgImage ) {
var w = orgImage.width;
var h = orgImage.height;
return new ImageData( w, h );
}
_correctColor( col ) {
return col;
}
_gamma( a ) {
return Math.pow( a/255, 1/this.gamma )*255;
}
_inverseGamma( a ) {
return Math.pow( a/255, this.gamma )*255;
}
getNearestColor() {
throw new Error( "Not implemented" );
}
decreaseColor( orgImage ) {
var resultImage = this._prepareNewImage( orgImage );
var w = orgImage.width;
var h = orgImage.height;
var errors = Array( 2 );
errors[0] = createTripletFloatArray( w );
errors[1] = createTripletFloatArray( w );
var dataArray = resultImage.data;
for ( var y = 0 ; y < h ; y ++ ) {
for ( var x = 0 ; x < w ; x ++ ) {
var ptr = y * w * 4 + x * 4;
var orgColor = pickColor( orgImage, ptr );
orgColor = this._correctColor( orgColor );
if ( this.dithering ) {
orgColor.R += errors[0][x][0];
orgColor.G += errors[0][x][1];
orgColor.B += errors[0][x][2];
}
var clipped = new RGBColor( clip( orgColor.R ), clip( orgColor.G ), clip( orgColor.B ) );
var newColor = this.getNearestColor( clipped );
dataArray[ptr+0] = newColor.R;
dataArray[ptr+1] = newColor.G;
dataArray[ptr+2] = newColor.B;
dataArray[ptr+3] = 255;
if ( this.dithering ) {
var errorR = orgColor.R - newColor.R;
var errorG = orgColor.G - newColor.G;
var errorB = orgColor.B - newColor.B;
if ( x < w - 1 ) {
errors[0][x+1][0] += errorR*7/16;
errors[0][x+1][1] += errorG*7/16;
errors[0][x+1][2] += errorB*7/16;
errors[1][x+1][0] += errorR*1/16;
errors[1][x+1][1] += errorG*1/16;
errors[1][x+1][2] += errorB*1/16;
}
if ( x > 0 ) {
errors[1][x-1][0] += errorR*3/16;
errors[1][x-1][1] += errorG*3/16;
errors[1][x-1][2] += errorB*3/16;
}
errors[1][x][0] += errorR*5/16;
errors[1][x][1] += errorG*5/16;
errors[1][x][2] += errorB*5/16;
}
}
errors[0] = errors[1];
errors[1] = createTripletFloatArray( w );
}
return new ConvertedImage( resultImage, this );;
}
}
class ConvertedImage {
constructor( img, conv ) {
this.image = img;
this.pixelFormat = conv.pixelFormat;
this.pixelFormatDescription = conv.pixelFormatDescription;
}
}
class ImageConverter_BW extends ImageConverter {
constructor() {
super();
this.thresholdLevel = 128;
}
get pixelFormat() {
return "BW1";
}
get pixelFormatDescription() {
var items = [];
items.push( "Black and White" );
if ( this.dithering ) {
items.push( "with dithering" );
} else {
items.push( "without dithering" );
items.push( `th=${this.thresholdLevel}` );
}
items.push( `Gamma=${this.gamma}` );
return items.join( " / " );
}
getNearestColor( v ) {
var th;
if ( this.dithering ) {
th = 128;
} else {
th = this.thresholdLevel;
}
if ( v < th ) {
return 0;
} else {
return 255;
}
}
decreaseColor( orgImage ) {
var resultImage = this._prepareNewImage( orgImage );
var w = orgImage.width;
var h = orgImage.height;
var errors = Array( 2 );
errors[0] = new Float32Array( w );
errors[1] = new Float32Array( w );
var dataArray = resultImage.data;
for ( var y = 0 ; y < h ; y ++ ) {
var dir;
var startX;
if ( y & 1 ) {
// right to left
dir = -1;
startX = w-1;
} else {
// left to right
dir = 1;
startX = 0;
}
for ( var x = startX ; 0 <= x && x < w ; x += dir ) {
var ptr = y * w * 4 + x * 4;
var orgColor = pickColor( orgImage, ptr ).luminance;
orgColor = this._inverseGamma( orgColor );
if ( this.dithering ) {
orgColor += errors[0][x];
}
var clipped = orgColor;
var newColor = this.getNearestColor( clipped );
dataArray[ptr+0] = newColor;
dataArray[ptr+1] = newColor;
dataArray[ptr+2] = newColor;
dataArray[ptr+3] = 255;
if ( this.dithering ) {
var error = orgColor - newColor;
if ( dir > 0 ) {
// left to right
if ( x < w - 1 ) {
errors[0][x+1] += error*7/16;
errors[1][x+1] += error*1/16;
}
if ( x > 0 ) {
errors[1][x-1] += error*3/16;
}
} else {
// right to left
if ( x < w - 1 ) {
errors[1][x+1] += error*3/16;
}
if ( x > 0 ) {
errors[0][x-1] += error*7/16;
errors[1][x-1] += error*1/16;
}
}
errors[1][x] += error*5/16;
}
}
errors[0] = errors[1];
errors[1] = new Float32Array( w );
}
return new ConvertedImage( resultImage, this );;
}
}
class ImageConverter_GrayScale extends ImageConverter {
constructor() {
super();
this.dithering = false;
}
get pixelFormat() {
return "GRAY8";
}
get pixelFormatDescription() {
return "8bit gray scale"
}
getNearestColor( col ) {
var y = col.luminance;
return new RGBColor( y, y, y );
}
}
class ImageConverter_3bit extends ImageConverter {
constructor() {
super();
}
get pixelFormat() {
return "RGB3";
}
get pixelFormatDescription() {
var items = [];
items.push( "3bit RGB (R:1, G:1, B:1)" );
if ( this.dithering ) {
items.push( "with dithering" );
} else {
items.push( "without dithering" );
}
items.push( `Gamma=${this.gamma}` );
return items.join( " / " );
}
_correctColor( col ) {
return new RGBColor( this._inverseGamma( col.R ), this._inverseGamma( col.G ), this._inverseGamma( col.B ) );
}
getNearestColor( col ) {
return new RGBColor(
col.R < 128 ? 0 : 255,
col.G < 128 ? 0 : 255,
col.B < 128 ? 0 : 255
);
}
}
class ImageConverter_RGB332 extends ImageConverter {
constructor() {
super();
}
get pixelFormat() {
return "RGB8";
}
get pixelFormatDescription() {
var items = [];
items.push( "8bit RGB (R:3, G:3, B:2)" );
if ( this.dithering ) {
items.push( "with dithering" );
} else {
items.push( "without dithering" );
}
return items.join( " / " );
}
_to3Bit( x ) {
return ( x & 0b11100000 ) | ( x >>> 3 );
}
_to2Bit( x ) {
return ( x & 0b11000000 ) | ( x >>> 2 );
}
getNearestColor( col ) {
return new RGBColor( this._to3Bit( col.R ), this._to3Bit( col.G ), this._to2Bit( col.B ) );
}
}
class ImageConverter_RGB565 extends ImageConverter {
constructor() {
super();
}
get pixelFormat() {
return "RGB16";
}
get pixelFormatDescription() {
var items = [];
items.push( "16bit RGB (R:5, G:6, B:5)" );
if ( this.dithering ) {
items.push( "with dithering" );
} else {
items.push( "without dithering" );
}
return items.join( " / " );
}
_to5Bit( x ) {
return ( x & 0b11111000 ) | ( x >>> 5 );
}
_to6Bit( x ) {
return ( x & 0b11111100 ) | ( x >>> 6 );
}
getNearestColor( col ) {
return new RGBColor( this._to5Bit( col.R ), this._to6Bit( col.G ), this._to5Bit( col.B ) );
}
}
class ImageConverter_RGB888 extends ImageConverter {
constructor() {
super();
}
get pixelFormat() {
return "RGB24";
}
get pixelFormatDescription() {
return "24bit RGB (R:8, G:8, B:8)";
}
decreaseColor( orgImage ) {
var resultImage = this._prepareNewImage( orgImage );
var w = orgImage.width;
var h = orgImage.height;
var dataArray = resultImage.data;